Welcome to our rebuilt site

We hope you will find what you need as we continue to add content. If you have any questions, please contact mchelpdesk@psu.edu.


Renowned, interdisciplinary researchers creating and disseminating new statistical methods for improving public health
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Research methods for experimental design and analysis of complex data in the social, behavioral, and health sciences
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Implement our methods in your research. Download free, user-friendly software for SAS, Stata, and R.
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Our work in leading journals is frequently cited by intervention designers and data analysts working to improve public health.
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New Resource for Learning TVEM

The TVEM Learning Path is designed to allow SAS users to teach themselves time-varying effect modeling.
Video Overview of Latent Transition Analysis (LTA)

Our latest video is a 15-minute conceptual overview of latent transition analysis (LTA). Bethany Bray introduces LTA with an example.
Join Us at SPR

Join us at the Society for Prevention Research (SPR) 2019 Annual Meeting, May 28 through 31 in San Francisco, California.